ACC / B0193 08
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Possible ventilation fan malfunction.
Possible AC malfunction.
Fan blower Circuit, Invalid Signal
Fault symptom
Possible ventilation fan malfunction.
Possible AC malfunction.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Ventilation fan activated. |
Fault criteria:
| No feedback signal from ventilation fan's internal control unit. |
| Open circuit/short circuit on PWM signal to ventilation fan control. |
System reaction to a fault:
| A/C function switched off. |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Electrical fault in connecting leads or component. |
Functions in the diagnostic tool related to the fault:
| (See also description of readings/activations in diagnostic tool) |
